单项选择题

A scientific law is liable at anytime to need ______, that is an eternal truth.

A．modifying
B．changing
C．revising
D．adjusting
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单项选择题
Building this road will ______ the construction of ten bridges, then the total cost reaches 1 million US Dollars.
A．evolve
B．involve
C．revolve
D．devolve
单项选择题
Paul is an ______ worker, and rarely does well in examinations. However he often refuses our help.
A．errant
B．erroneous
C．erratic
D．exotic
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